mofrr-primary-path-selection-by-routing (Multicast-Only Fast Reroute)

Syntax

Hierarchy Level

Description

MoFRR is supported on both equal-cost multipath (ECMP) paths and non-ECMP paths. Unicast loop-free alternate (LFA) routes need to be enabled to support MoFRR on non-ECMP paths. LFA routes are enabled with the link-protection statement in the interior gateway protocol (IGP) configuration. When you enable link protection on an OSPF or IS-IS interface, Junos OS creates a backup LFA path to the primary next hop for all destination routes that traverse the protected interface.

In the context of load balancing, MoFRR prioritizes the disjoint backup in favor of load balancing the available paths.

For Junos OS releases before 15.1R7, for both ECMP and Non-ECMP scenarios, the default MoFRR behavior was sticky , that is, if the Active link went down, the Active Path selection would give preference to Backup Path for the transition. The Active Path would not follow the unicast selected gateway

Starting in Junos OS Release 15.1R7 however, the default behavior for non-EMCP scenarios is to be nonsticky, that is, the selection of Active Path strictly follows unicast selected gateway. MoFRR no longer chooses a unicast LFA path to become the MoFRR Active path; only a unicast LFA path can be selected to become MoFRR Backup.

Default

By default, the backup path gets promoted to be the primary path when MoFRR is configured in a PIM domain.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 14.1.